Also known as Tyramine receptor 1 (Tyr-Loc1).G-protein coupled receptor for tyramine, a known neurotransmitter and neuromodulator and direct precursor of octopamine. The rank order of potency for agonists of this receptor is tyramine > naphazoline > tolazoline > DL-octopamine > dopamine > epinephrine > 5-hydroxytryptamine. For antagonists, the rank order is yohimbine > chlorpromazine > mianser